OK, let's work through this together. We're starting with 643 and we're going to multiply it by 229, which means we add 643 to itself 229 times.
Step 1: 0 + 643 = 643
Step 2: 643 + 643 = 1286
Step 3: 1286 + 643 = 1929
Step 4: 1929 + 643 = 2572
Step 5: 2572 + 643 = 3215
Step 6: 3215 + 643 = 3858
Step 7: 3858 + 643 = 4501
Step 8: 4501 + 643 = 5144
Step 9: 5144 + 643 = 5787
Step 10: 5787 + 643 = 6430
Step 11: 6430 + 643 = 7073
Step 12: 7073 + 643 = 7716
Step 13: 7716 + 643 = 8359
Step 14: 8359 + 643 = 9002
Step 15: 9002 + 643 = 9645
Step 16: 9645 + 643 = 10288
Step 17: 10288 + 643 = 10931
Step 18: 10931 + 643 = 11574
Step 19: 11574 + 643 = 12217
Step 20: 12217 + 643 = 12860
Step 21: 12860 + 643 = 13503
Step 22: 13503 + 643 = 14146
Step 23: 14146 + 643 = 14789
Step 24: 14789 + 643 = 15432
Step 25: 15432 + 643 = 16075
Step 26: 16075 + 643 = 16718
Step 27: 16718 + 643 = 17361
Step 28: 17361 + 643 = 18004
Step 29: 18004 + 643 = 18647
Step 30: 18647 + 643 = 19290
Step 31: 19290 + 643 = 19933
Step 32: 19933 + 643 = 20576
Step 33: 20576 + 643 = 21219
Step 34: 21219 + 643 = 21862
Step 35: 21862 + 643 = 22505
Step 36: 22505 + 643 = 23148
Step 37: 23148 + 643 = 23791
Step 38: 23791 + 643 = 24434
Step 39: 24434 + 643 = 25077
Step 40: 25077 + 643 = 25720
Step 41: 25720 + 643 = 26363
Step 42: 26363 + 643 = 27006
Step 43: 27006 + 643 = 27649
Step 44: 27649 + 643 = 28292
Step 45: 28292 + 643 = 28935
Step 46: 28935 + 643 = 29578
Step 47: 29578 + 643 = 30221
Step 48: 30221 + 643 = 30864
Step 49: 30864 + 643 = 31507
Step 50: 31507 + 643 = 32150
Step 51: 32150 + 643 = 32793
Step 52: 32793 + 643 = 33436
Step 53: 33436 + 643 = 34079
Step 54: 34079 + 643 = 34722
Step 55: 34722 + 643 = 35365
Step 56: 35365 + 643 = 36008
Step 57: 36008 + 643 = 36651
Step 58: 36651 + 643 = 37294
Step 59: 37294 + 643 = 37937
Step 60: 37937 + 643 = 38580
Step 61: 38580 + 643 = 39223
Step 62: 39223 + 643 = 39866
Step 63: 39866 + 643 = 40509
Step 64: 40509 + 643 = 41152
Step 65: 41152 + 643 = 41795
Step 66: 41795 + 643 = 42438
Step 67: 42438 + 643 = 43081
Step 68: 43081 + 643 = 43724
Step 69: 43724 + 643 = 44367
Step 70: 44367 + 643 = 45010
Step 71: 45010 + 643 = 45653
Step 72: 45653 + 643 = 46296
Step 73: 46296 + 643 = 46939
Step 74: 46939 + 643 = 47582
Step 75: 47582 + 643 = 48225
Step 76: 48225 + 643 = 48868
Step 77: 48868 + 643 = 49511
Step 78: 49511 + 643 = 50154
Step 79: 50154 + 643 = 50797
Step 80: 50797 + 643 = 51440
Step 81: 51440 + 643 = 52083
Step 82: 52083 + 643 = 52726
Step 83: 52726 + 643 = 53369
Step 84: 53369 + 643 = 54012
Step 85: 54012 + 643 = 54655
Step 86: 54655 + 643 = 55298
Step 87: 55298 + 643 = 55941
Step 88: 55941 + 643 = 56584
Step 89: 56584 + 643 = 57227
Step 90: 57227 + 643 = 57870
Step 91: 57870 + 643 = 58513
Step 92: 58513 + 643 = 59156
Step 93: 59156 + 643 = 59799
Step 94: 59799 + 643 = 60442
Step 95: 60442 + 643 = 61085
Step 96: 61085 + 643 = 61728
Step 97: 61728 + 643 = 62371
Step 98: 62371 + 643 = 63014
Step 99: 63014 + 643 = 63657
Step 100: 63657 + 643 = 64300
Step 101: 64300 + 643 = 64943
Step 102: 64943 + 643 = 65586
Step 103: 65586 + 643 = 66229
Step 104: 66229 + 643 = 66872
Step 105: 66872 + 643 = 67515
Step 106: 67515 + 643 = 68158
Step 107: 68158 + 643 = 68801
Step 108: 68801 + 643 = 69444
Step 109: 69444 + 643 = 70087
Step 110: 70087 + 643 = 70730
Step 111: 70730 + 643 = 71373
Step 112: 71373 + 643 = 72016
Step 113: 72016 + 643 = 72659
Step 114: 72659 + 643 = 73302
Step 115: 73302 + 643 = 73945
Step 116: 73945 + 643 = 74588
Step 117: 74588 + 643 = 75231
Step 118: 75231 + 643 = 75874
Step 119: 75874 + 643 = 76517
Step 120: 76517 + 643 = 77160
Step 121: 77160 + 643 = 77803
Step 122: 77803 + 643 = 78446
Step 123: 78446 + 643 = 79089
Step 124: 79089 + 643 = 79732
Step 125: 79732 + 643 = 80375
Step 126: 80375 + 643 = 81018
Step 127: 81018 + 643 = 81661
Step 128: 81661 + 643 = 82304
Step 129: 82304 + 643 = 82947
Step 130: 82947 + 643 = 83590
Step 131: 83590 + 643 = 84233
Step 132: 84233 + 643 = 84876
Step 133: 84876 + 643 = 85519
Step 134: 85519 + 643 = 86162
Step 135: 86162 + 643 = 86805
Step 136: 86805 + 643 = 87448
Step 137: 87448 + 643 = 88091
Step 138: 88091 + 643 = 88734
Step 139: 88734 + 643 = 89377
Step 140: 89377 + 643 = 90020
Step 141: 90020 + 643 = 90663
Step 142: 90663 + 643 = 91306
Step 143: 91306 + 643 = 91949
Step 144: 91949 + 643 = 92592
Step 145: 92592 + 643 = 93235
Step 146: 93235 + 643 = 93878
Step 147: 93878 + 643 = 94521
Step 148: 94521 + 643 = 95164
Step 149: 95164 + 643 = 95807
Step 150: 95807 + 643 = 96450
Step 151: 96450 + 643 = 97093
Step 152: 97093 + 643 = 97736
Step 153: 97736 + 643 = 98379
Step 154: 98379 + 643 = 99022
Step 155: 99022 + 643 = 99665
Step 156: 99665 + 643 = 100308
Step 157: 100308 + 643 = 100951
Step 158: 100951 + 643 = 101594
Step 159: 101594 + 643 = 102237
Step 160: 102237 + 643 = 102880
Step 161: 102880 + 643 = 103523
Step 162: 103523 + 643 = 104166
Step 163: 104166 + 643 = 104809
Step 164: 104809 + 643 = 105452
Step 165: 105452 + 643 = 106095
Step 166: 106095 + 643 = 106738
Step 167: 106738 + 643 = 107381
Step 168: 107381 + 643 = 108024
Step 169: 108024 + 643 = 108667
Step 170: 108667 + 643 = 109310
Step 171: 109310 + 643 = 109953
Step 172: 109953 + 643 = 110596
Step 173: 110596 + 643 = 111239
Step 174: 111239 + 643 = 111882
Step 175: 111882 + 643 = 112525
Step 176: 112525 + 643 = 113168
Step 177: 113168 + 643 = 113811
Step 178: 113811 + 643 = 114454
Step 179: 114454 + 643 = 115097
Step 180: 115097 + 643 = 115740
Step 181: 115740 + 643 = 116383
Step 182: 116383 + 643 = 117026
Step 183: 117026 + 643 = 117669
Step 184: 117669 + 643 = 118312
Step 185: 118312 + 643 = 118955
Step 186: 118955 + 643 = 119598
Step 187: 119598 + 643 = 120241
Step 188: 120241 + 643 = 120884
Step 189: 120884 + 643 = 121527
Step 190: 121527 + 643 = 122170
Step 191: 122170 + 643 = 122813
Step 192: 122813 + 643 = 123456
Step 193: 123456 + 643 = 124099
Step 194: 124099 + 643 = 124742
Step 195: 124742 + 643 = 125385
Step 196: 125385 + 643 = 126028
Step 197: 126028 + 643 = 126671
Step 198: 126671 + 643 = 127314
Step 199: 127314 + 643 = 127957
Step 200: 127957 + 643 = 128600
Step 201: 128600 + 643 = 129243
Step 202: 129243 + 643 = 129886
Step 203: 129886 + 643 = 130529
Step 204: 130529 + 643 = 131172
Step 205: 131172 + 643 = 131815
Step 206: 131815 + 643 = 132458
Step 207: 132458 + 643 = 133101
Step 208: 133101 + 643 = 133744
Step 209: 133744 + 643 = 134387
Step 210: 134387 + 643 = 135030
Step 211: 135030 + 643 = 135673
Step 212: 135673 + 643 = 136316
Step 213: 136316 + 643 = 136959
Step 214: 136959 + 643 = 137602
Step 215: 137602 + 643 = 138245
Step 216: 138245 + 643 = 138888
Step 217: 138888 + 643 = 139531
Step 218: 139531 + 643 = 140174
Step 219: 140174 + 643 = 140817
Step 220: 140817 + 643 = 141460
Step 221: 141460 + 643 = 142103
Step 222: 142103 + 643 = 142746
Step 223: 142746 + 643 = 143389
Step 224: 143389 + 643 = 144032
Step 225: 144032 + 643 = 144675
Step 226: 144675 + 643 = 145318
Step 227: 145318 + 643 = 145961
Step 228: 145961 + 643 = 146604
Step 229: 146604 + 643 = 147247

So, 643*229 = 147247